''Another Earth'' is a 2011 independent ScienceFiction film directed by Mike Cahill and written by Cahill and leading actress Brit Marling. It was distributed by {{Fox}} Searchlight Pictures. It is about the discovery of [[CounterEarth a duplicate of planet Earth]] and its effects on the lives of two people.

Rhoda Williams is a young woman who has just been accepted in MIT. She has a great future ahead of her, but after celebrating by drinking, she has a car accident when she is distracted by the sight of a planet in the sky that resembles Earth. The struck car belongs to a composer named John Burroughs, and his wife and children die in the crash. He himself is left in a coma.

The vision in the sky isn't an illusion; somehow, a duplicate of Earth, with the same people as well, has appeared near our planet, leading to worldwide shock and interest. But the story focuses on Rhoda's and John's lives. Rhoda spends four years in prison for drunken driving, ruining her life. John recovers but falls into despair. Wracked with guilt, Rhoda finds John, but doesn't tell him who she is. Slowly, they start bonding.

A further twist comes in the way of a contest to earn passage in a spaceship that will visit the Other Earth.
!!Tropes in ''Another Earth'':
* AlienSky: Actually, it's Earth's sky with [[TitleDrop another Earth]] in it.
%%Don't spoiler-tag the Ambiguous Clone Ending trope name - it's not a secret the people in this movie have exact doubles.%%
* AmbiguousCloneEnding: Sort of. Just before the movie ends, [[spoiler: we see Rhoda meeting herself. They don't say a word before the credits roll, so the details of whose Earth we're on, the differences between their lives, and what's happened in the 4 months since the launch are not specified. However, it seems likely that Rhoda's theory was right - Rhoda 2 never hit John 2's family, so there was nothing holding her back from coming to Earth 1 and meeting Rhoda 1.]]
* ArtisticLicense: The [[TropesAreTools film deliberately]] [[TropesAreNotBad invokes this]] in both {{a|rtisticLicenseAstronomy}}stronomy and [[ArtisticLicensePhysics physics]]. Many scifi fans have complained that the film pushes their WillingSuspensionOfDisbelief a little too far, however keep in mind that this movie is a drama about grief and ''[[TropesAreTools not about people running around in terror as the Earth is endangered]]''[[note]]There are plenty of examples of that in fiction already, after all.[[/note]].
** Among other things:
*** The other Earth is always portrayed as "full" in the sky during the day (the way the Moon is full). It would have to stay on the night side of Earth to do that unless it was only being viewed at sunrise and sunset.
*** A second planet of Earth-size in our very balanced the solar system really would throw all the other orbits in the inner solar system off.
*** Even if the planet had been hiding behind the sun the whole time before it appeared we would have already been able to infer it from its affect on the other orbits in the inner solar system.
*** If a planet that close were coming that close to Earth people would be more worried about a collision.
*** Ocean tides here on Earth are the result of the moon pulling on the Earth. Another Earth so close as to be bigger than the moon in the sky would send ocean tides over huge swaths of populated land.
*** And if it's ''that'' close, our own moon would have crashed into it.
*** Before the radio communication, no one on "our" Earth seemed to have taken notice of (presumably) cities in the same place, for example. That would have tipped onto the almost exact similarity of the two worlds.
* TheAtoner: Rhoda.
* AtTheCrossroads: What to do with the ticket.
* ConspiracyTheorist: Rhoda passes one, complete with sandwich board and tinfoil hat.
* ConvenientComa: So John can't recognize his family's killer.
* ConvenientlyClosePlanet: The other earth, right out there in the sky.
* CounterEarth: Sort of.
* DawsonCasting: Brit Marling was 28, but played 21-year old Rhoda (as well as at 17, briefly).
* DeathByOriginStory: John's family.
* FanDisservice: Rhoda taking her clothes off in the middle of winter, trying to commit suicide by freezing to death while naked. At first it almost feels like very beautiful, stunning, almost poetic {{Fanservice}} and then you realize she's trying to kill herself and it becomes all the more painful to watch.
* HeroicBSOD: John has one when Rhoda reveals [[spoiler: that she was the one that killed his family]].
* ItsAWonderfulPlot: Inverted.
* MayDecemberRomance
* NoBudget: Shot mostly in Cahill's home and neighbourhood. The prison scene was shot by having Marling pose as a yoga instructor, walk into the local jail, and then walk out again before anyone had time to check her credentials, while Cahill filmed it all from a car outside.
* PointOfView: {{Lampshaded}} in-universe.
-->'''John:''' You think ''they'' call ''us'' "Earth One"?
* TheReveal: [[spoiler:Rhoda's counterpart had a successful life.]]
* SelfHarm: [[spoiler:We learn Purdeep had blinded himself and during the movie deafened himself.]]
* TwistEnding
* WhatHappenedToTheMouse: We never do find out what the tapping noise was in Rhoda's cosmonaut story.